U.S. patent application number 13/541205 was filed with the patent office on 2013-01-10 for method for recognizing touch and display apparatus thereof.
This patent application is currently assigned to SAMSUNG ELECTRONICS CO., LTD.. Invention is credited to Kyoung-oh CHOI, Young-ran HAN.
Application Number | 20130009912 13/541205 |
Document ID | / |
Family ID | 45811378 |
Filed Date | 2013-01-10 |
United States Patent
Application |
20130009912 |
Kind Code |
A1 |
HAN; Young-ran ; et
al. |
January 10, 2013 |
METHOD FOR RECOGNIZING TOUCH AND DISPLAY APPARATUS THEREOF
Abstract
A method and system for recognizing a touch of a display system
including a plurality of touch screens is provided. The method for
recognizing a touch of a display system including a plurality of
touch screens includes: operating each of the plurality of touch
screens according to an individually set pulse signal; in response
to a point on a touch screen of the plurality of touch screens
being touched by a digital pen, detecting a pulse signal of the
touched touch screen by the digital pen; determining coordinate
information of the touched point by the digital pen; and
recognizing the touch screen among the plurality of touch screens
and coordinate information of the touched point according to at
least one characteristic of the detected pulse signal.
Inventors: |
HAN; Young-ran; (Suwon-si,
KR) ; CHOI; Kyoung-oh; (Seoul, KR) |
Assignee: |
SAMSUNG ELECTRONICS CO.,
LTD.
Suwon-si
KR
|
Family ID: |
45811378 |
Appl. No.: |
13/541205 |
Filed: |
July 3, 2012 |
Current U.S.
Class: |
345/175 |
Current CPC
Class: |
G06F 3/03542 20130101;
G06F 3/03545 20130101; G06F 3/038 20130101 |
Class at
Publication: |
345/175 |
International
Class: |
G06F 3/042 20060101
G06F003/042 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 8, 2011 |
KR |
10-2011-0068045 |
Claims
1. A method for recognizing a touch of a display system including a
plurality of touch screens, the method comprising: operating each
of the plurality of touch screens according to an individually set
pulse signal; in response to a point on a touch screen of the
plurality of touch screens being touched by a digital pen,
detecting a pulse signal of the touched touch screen by the digital
pen; determining coordinate information of the touched point by the
digital pen; and recognizing the touch screen among the plurality
of touch screens and coordinate information of the touched point
according to at least one characteristic of the detected pulse
signal.
2. The method as claimed in claim 1, wherein the recognizing
comprises transmitting the at least one characteristic of the
detected pulse signal and the detected coordinate information to a
control device by the digital pen; and reading touch screen
information corresponding to the at least one characteristic of the
detected pulse signal from a memory by the control device.
3. The method as claimed in claim 1, wherein the recognizing
comprises transmitting information of a touch screen corresponding
to characteristics of the sensed pulse signal and the detected
coordinate information to the control device by the digital
pen.
4. The method as claimed in claim 1, wherein the operating each of
the plurality of touch screens according to the individually set
pulse signal comprises altering at least one of a pulse-width and a
pulse-shape of each pulse signal provided by the plurality of touch
screens.
5. The method as claimed in claim 1, wherein the detecting
comprises detecting a pulse signal operating a backlight unit
included in the touched touch screen by using a photo-diode.
6. The method as claimed in claim 1, wherein the detecting
comprises receiving an infrared (IR) signal emitted from a sensing
element located at the touched point among a plurality of sensing
elements included in the touched touch screen by the digital pen;
detecting a sensing element located at the touched point by a type
of the received IR signal; and detecting coordinate information
corresponding to a location of the detected sensing element.
7. The method as claimed in claim 6, wherein the sensing element is
a pattern sheet composed of different patterns.
8. The method of claim 1, wherein the pulse signal is a pulse width
modulation operating signal which operates a backlight unit
included in the touch screen.
9. A display system comprising; a plurality of touch screens, each
of the plurality of touch screens being operated according to
individually set pulse signal; a control unit to control an
operation of the plurality of touch screens; and a digital pen
which when a point on a touch screen of the plurality of touch
screens is touched by the digital pen detects a pulse signal of the
touched touch screen and determines coordinate information of the
touched point, wherein the control unit recognizes coordinate
information of the touched point and the touched touch screen among
the plurality of touch screens by at least one characteristic of
the pulse signal detected by the digital pen and the detected
coordinate information.
10. The system as claimed in claim 9, wherein the digital pen
transmits at least one characteristic of the detected pulse signal
and the determined coordinate information to the control unit; and
wherein the control unit reads touch screen information
corresponding to the at least one characteristic of the pulse
signal from a memory, and recognizing the touch screen among the
plurality of touch screens.
11. The system as claimed in claim 9, wherein the digital pen
transmits information of a touch screen corresponding to
characteristics of the sensed pulse signal and the detected
coordinate information to the control unit.
12. The system as claimed in claim 9, wherein the control unit
alters at least one of a pulse-width and a pulse-shape of each
pulse signal provided by the plurality of touch screens.
13. The system as claimed in claim 9, wherein the digital pen
detects a pulse signal operating a backlight unit provided on the
touched touch screen, using a photo-diode.
14. The system as claimed in claim 9, wherein the digital pen
receives an infrared (IR) signal emitted from a sensing element
located at the touched point out of a plurality sensing elements
built into the touched touch screen, recognizes the sensing element
located at the touched point by a type of the received IR signal,
and detects coordinate information corresponding to a location of
the recognized sensing element.
15. The system as claimed in claim 14, wherein the sensing element
comprises a plurality of patterns.
16. The system as claimed in claim 9, wherein the pulse signal is a
pulse width modulation operating signal which operates a backlight
unit provided in the touch screen.
17. The system as claimed in claim 9, wherein the control unit
controls the recognized touch screen to display an object
corresponding to the recognized touch screen and the coordinate
information of the touched point.
18. A non-transitory computer readable medium which stores a
program which when executed by a computer performs the method of
claim 1.
19. A display system comprising: a plurality of touch screens; a
digital pen which, when a point on a touch screen of the plurality
of touch screens is touched, detects a signal of the touched touch
screen, and transmits information corresponding to the detected
signal of the touched touch screen; a control unit which controls
an operation of the plurality of touch screens, and recognizes the
touched touch screen among the plurality of touch screens based on
the information transmitted by the digital pen.
20. The display system as claimed in claim 19, wherein the signal
is a pulse signal, and the control unit alters at least one of a
pulse-width and a pulse-shape of each of the pulse signals of the
plurality of touch screens.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority under 35 U.S.C. .sctn.119
from Korean Patent Application No. 10-2011-0068045, filed on Jul.
8, 2011 in the Korean Intellectual Property Office, the disclosure
of which is hereby incorporated herein by reference in its
entirety.
BACKGROUND
[0002] 1. Field
[0003] Methods and apparatuses consistent with exemplary
embodiments relate to a method for recognizing touch, and more
particularly, to recognizing touch in a display system which
includes a plurality of touch screens using a digital pen.
[0004] 2. Description of the Related Art
[0005] In the related art, touch screens adopt touch sensing
devices such as a camera, an Infrared (IR) system, a Resistive
system, a Capacitive system, and/or a digital pen to detect a
sensing element of a touch screen.
[0006] For multi-display systems including a plurality of touch
screens adopting a camera, an IR system, a Resistive system, and a
Capacitive system without using a digital pen or stylus, it is easy
to detect a touched touch screen and a coordinate of a touched
point because sensing the coordinate of the touched point is
performed by a touch screen.
[0007] For example, in a display system with three touch screens A,
B and C, if a user touches the touch screen B, the touch screen B
detects the touch input of the user and transmits an identifier
(ID) of the touch screen B and the coordinate information of the
touched point. Since a touch screen touched by a user can confirm
the touch event is located on its own screen, a control unit may
receive the ID of the touch screen along with the coordinate of the
touched point from the touch screen itself.
[0008] However, in the case of a method of using a digital pen, a
coordinate of a touched point is not detected by a touch screen but
by a digital pen, so it is not easy to recognize exactly which
touch screen is touched in a multi-display system with a plurality
of touch screens.
[0009] For example, in a multi-display system including three touch
screens A, B and C, and sensing elements built into those touch
screens that are identical to one another, if a user touches the
touch screen B, a digital pen may detect the coordinate of the
touched point but it does not recognize which touch screen A, B or
C, was touched.
[0010] It may be possible to identify an ID of a touch screen by
setting a different sensing element in each touch screen; however,
considering the reality of touch screens being mass-produced, it is
almost impossible and very costly to set different IDs for each
touch screen.
[0011] Therefore, there is a need for a method of recognizing which
screen is touched and/or selected by a digital pen and a coordinate
of a point touched by a digital pen in a multi-display system
including a plurality of touch screens.
SUMMARY
[0012] Exemplary embodiments address at least the above problems
and/or disadvantages and other disadvantages not described above.
However, an exemplary embodiment is not required to overcome the
disadvantages described above, and an exemplary embodiment is not
required to overcome and may not overcome any of the problems
described above.
[0013] Exemplary embodiments provide a method for recognizing a
touched screen by sensing a pulse signal of the touched screen, if
one of a plurality of touch screens which are operated using an
individually set pulse signal is touched by a digital pen, and a
display system or apparatus using the same.
[0014] According to an aspect of an exemplary embodiment there is
provided a method for recognizing a touch of a display system
including a plurality of touch screens, the method including
operating each of the plurality of touch screens according to an
individually set pulse signal; when one of the plurality of touch
screens is touched by a digital pen, sensing a pulse signal of the
touched touch screen by the digital pen; determining coordinate
information of the point touched by the digital pen; recognizing a
touch screen which is touched out of the plurality of touch screens
and a coordinate of the touched point of the screen according to at
least one characteristic of the detected pulse signal and the
detected coordinate information by a control device which controls
the plurality of touch screens.
[0015] The recognizing may include transmitting at least one
characteristic of the detected pulse signal and the detected
coordinate information to the control device by the digital pen;
and reading and extracting touch screen information corresponding
to at least one characteristic of the pulse signal from a memory by
the control device.
[0016] The recognizing may further include transmitting touch
screen information corresponding to at least one characteristic of
the detected pulse signal and the detected coordinate information
to the control device by the digital pen.
[0017] The operating each of the plurality of touch screens
according to the individually set pulse signal may include altering
at least one of a pulse-width and a pulse-shape of each of the
pulse signals provided to the plurality of touch screens.
[0018] The sensing may include detecting a pulse signal operating a
backlight unit provided on the touched touch screen by the digital
pen, using a photo-diode.
[0019] The detecting may include the digital pen receiving an IR
signal emitted from a sensing element located at the touched point
out of a plurality sensing elements built into the touched touch
screen; detecting a sensing element located at the touched point by
a type of the received IR signal; and determining coordinate
information corresponding to a location of the recognized sensing
element.
[0020] The pulse signal may be a pulse width modulation (PWM)
operating signal which operates a backlight unit provided on the
touch screen.
[0021] According to an aspect of another exemplary embodiment,
there is provided a display system including: a plurality of touch
screen units respectively operating according to individually set
pulse signals; a control unit to control an operation of the
plurality of touch screens, wherein when one of the plurality of
touch screens is touched, a pulse signal of the touched touch
screen is detected, and coordinate information of the touched point
is detected, wherein the control unit is informed of the coordinate
information by the digital pen; wherein the control unit recognizes
a coordinate of the touched point and the touched touch screen out
of the plurality of touch screens by at least one characteristic of
the pulse signal detected by the digital pen and the detected
coordinate information.
[0022] The digital pen may transmit at least one characteristic of
the detected pulse signal and the detected coordinate information
to the control unit; the control unit may read and extract touch
screen information corresponding to the at least one characteristic
of the pulse signal from a memory and recognize a touch screen
which is touched out of the plurality of touch screens.
[0023] Further, the digital pen may transmit touch screen
information corresponding to at least one characteristic of the
detected pulse signal and the detected coordinate information to
the control unit.
[0024] The control unit may alter at least one of a pulse-width and
a pulse-shape of each of the pulse signals provided to the
plurality of touch screens so that the pulse signals are distinct
for each of the plurality of touch screens.
[0025] The digital pen may detect a pulse signal which operates a
backlight unit provided on the touched touch screen, using a
photo-diode.
[0026] The digital pen may also receive an IR signal emitted from a
sensing element located at the touched point out of a plurality of
sensing elements built into the touched touch screen, recognize a
sensing element located at the touched point by a type of the
received IR signal, and detect coordinate information corresponding
to a location of the recognized sensing element.
[0027] The pulse signal may be a PWM operating signal which
operates a backlight unit provided on the touch screen.
[0028] The control unit may control the recognized touch screen to
display an object corresponding to the recognized touch screen and
a coordinate of the touched point.
BRIEF DESCRIPTION OF THE DRAWINGS
[0029] The above and/or other aspects will be more apparent by
describing certain exemplary embodiments with reference to the
accompanying drawings, in which:
[0030] FIG. 1 is a view illustrating a display system including a
plurality of touch screens according to an exemplary
embodiment;
[0031] FIG. 2 is a view illustrating a touch screen according to an
exemplary embodiment;
[0032] FIG. 3 is a block diagram illustrating a digital pen
according to an exemplary embodiment;
[0033] FIGS. 4 and 5 are views provided to explain a method for
recognizing touch according to an exemplary embodiment; and
[0034] FIG. 6 is a flowchart provided to explain a method for
recognizing a touch of a display system according to an exemplary
embodiment;
DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS
[0035] Certain exemplary embodiments will now be described in
greater detail with reference to the accompanying drawings.
[0036] In the following description, the same drawing reference
numerals are used for the same elements throughout the drawings.
The matters defined in the description, such as detailed
construction and elements, are provided to assist in a
comprehensive understanding of the inventive concept. Therefore,
exemplary embodiments can be carried out without those specifically
defined matters. Also, well-known functions or constructions are
not described in detail since they would obscure the inventive
concept with unnecessary detail. The term "unit" as used herein
means a hardware component such as a processor or circuit, and/or
software component that is executed by a hardware component such as
a processor.
[0037] FIG. 1 is a view illustrating a display system including a
plurality of touch screens according to an exemplary embodiment.
The display system includes a plurality of touch screens. For
example first and second touch screens 100-1 and 100-2, a digital
pen or stylus 200 and a control unit 300. The system may also be
configured to use other input devices known in the art.
[0038] In this case, a display system 10 may be embodied as an
electronic board. However, this is only an exemplary embodiment,
and the technical features of the present exemplary embodiments may
be applied to multi-display systems including a plurality of touch
screens.
[0039] The plurality of touch screens 100-1 and 100-2 include
sensing elements which detect a touch of the digital pen 200. For
example, a sensing element may be embodied as a special pattern or
an IR luminous unit depending on an input method of the digital pen
200. If the digital pen 200 adopts a pattern sensing method, a
sensing element is a specific pattern built in the upper portion of
a touch screen, and the specific pattern may be detected by the
digital pen 200 and a coordinate of a touched point can be
recognized. Further, if the digital pen 200 adopts an IR sensing
method, a sensing element is an IR luminous unit which has a
different frequency according to each coordinate, and the digital
pen 200 mounted with an IR light intercepting unit may detect the
IR signal and a coordinate of a touched point may be recognized.
However, this exemplary embodiment is not limiting and the
technical features of the present exemplary embodiments can be
applied to other types of sensing elements adopting other sensing
methods, in which touch inputs and/or selections are made using the
digital pen 200.
[0040] Further, the plurality of touch screens 100-1 and 100-2 may
be operated according to individually set pulse signals. For
instance, the first touch screen 100-1 may be operated by a
backlight unit having an A-type pulse signal and the second touch
screen 100-2 may be operated by a backlight unit having a B-type
pulse signal.
[0041] The pulse-widths (on/off section of a pulse) and the
pulse-shapes of the first touch screen 100-1 and the second touch
screen 100-2 may be set differently. However, the pulse cycles of
the first touch screen 100-1 and the second touch screen 100-2 may
be identical to each other since the first touch screen 100-1 and
the second touch screen 100-2 may be operated using identical
brightness.
[0042] In this case, a pulse signal may be a PWM pulse signal of a
backlight unit of the touch screen 100. However, the technical
features of the exemplary embodiments can be applied to other types
of pulse signals encoded with a part of a pulse-shaped PWM pulse
signal which operates a backlight unit.
[0043] In a multi-display system using a plurality of touch
screens, the pulse signals of the plurality of touch screens 100-1
and 100-2 may be individually set through the use of firmware.
[0044] Although there are two touch screens shown in the exemplary
embodiment of FIG. 1, the technical features of the present
exemplary embodiments may be applied to display systems including
more than two touch screens.
[0045] The digital pen 200 detects a coordinate of a touched point
by detecting a sensing element provided on the touch screen 100.
For example, the digital pen 200 may detect sensing elements by
various methods described above.
[0046] Further, the digital pen 200 may detect pulse signals
operating in the plurality of touch screens 100-1 and 100-2. For
example, pulse signals operating in the plurality of touch screens
100-1 and 100-2 have different pulse-widths and pulse-shapes from
each other. Accordingly, the digital pen 200 may be mounted with a
photo-diode to detect different pulse signals. For example, the
digital pen 200 may detect a pulse signal by analyzing a pulse
signal of the touch screen 100, using a photo-diode.
[0047] The digital pen 200 then may transmit information
corresponding to the detected pulse signal and the detected
coordinate information of the touched point to the control unit 300
which controls the touch screen 100. For example, the digital pen
200 may transmit the detected information of a pulse signal
directly to the control unit 300.
[0048] In addition, the digital pen 200 may transmit touch screen
information corresponding to the detected pulse signal to the
control unit 300. For example, the digital pen 200 may store the
plurality of touch screens 300 and their corresponding pulse
signals, and read and extract touch screen information
corresponding to the detected pulse signal for example, an ID of a
touch screen and transmit it to the control unit 300.
[0049] The control unit 300 controls the plurality of touch screens
100-1 and 100-2 by receiving a user's command. Especially, the
control unit 300 recognizes a touched point and a touched screen
out of the plurality of touch screens using pulse signal
information transmitted from the digital pen 200 and a coordinate
of a touched point.
[0050] In the case that a detected pulse signal is transmitted
directly from the digital pen 200, the control unit 300 may
recognize a touched touch screen by reading and extracting touch
screen information corresponding to at least one characteristic of
the detected pulse signal from a memory. The control unit 300 may
also control the touched touch screen to display an object at a
touched point of the detected coordinate of the touched touch
screen.
[0051] When touch screen information corresponding to the detected
pulse signal is transmitted from the digital pen 200, the control
unit 300 may control the touched touch screen to display an object
at the detected coordinate of the touched touch screen by
immediately recognizing the corresponding touch screen.
[0052] For example, the control unit 300 may be an external
apparatus as illustrated in FIG. 1. The control unit could also be
embodied as a control unit built inside of the touch screen 100.
For example, the digital pen 200 may transmit information
corresponding to a pulse signal and coordinate information of the
touched point to control units built into the plurality of touch
screens respectively or only to the control unit of the touched
touch screen.
[0053] As described above, because a touched touch screen is
recognized by detecting a pulse signal operating the touch screen,
a user may input a command by touch more accurately.
[0054] FIG. 2 and FIG. 3 illustrate elements of the touch screen
100 and the digital pen 200 which will be explained as below.
[0055] FIG. 2 is a view illustrating the touch screen 100 according
to an exemplary embodiment. The touch screen 100 includes, as
illustrated in FIG. 2, a backlight unit 110, an LCD panel 120 and a
sensing element 130.
[0056] The backlight unit 110 operates sensing elements by
receiving signals created in an image processing unit and projects
backlight to the LCD panel 120 since the LCD panel 120 may not emit
light on its own.
[0057] The backlight unit 110 may be operated in a method of PWM.
The pulse signals according to a method of PWM may be set
differently for each of the plurality of touch screens 100-1 and
100-2 by user setting. The plurality of touch screens 100-1 and
100-2 may be set to be operated by pulse signals having different
pulse-widths on/off section of a pulse or pulse-shapes. However,
the pulse cycles of the pulse signals operating the plurality of
touch screens 100-2, 100-2 may be identical to each other. This is
because the first touch screen 100-1 and the second touch screen
100-2 may be operated using identical brightness settings.
[0058] The LCD panel 120 makes an image signal visible by adjusting
a penetration rate of backlight emitted from the backlight unit 110
to have the image displayed on a screen. The LCD panel 110 is
manufactured by arranging two circuit boards with an electrode to
face each other and injected with a liquid substance between the
two circuit boards. When a voltage is applied to the electrodes, an
electric field is generated and adjusts the penetration rate of
backlight by having a molecule of the liquid substance injected
between the two circuit boards.
[0059] The sensing element 130 is a set to detect a coordinate of a
point of a touch input of the digital pen 200. The sensing element
130 may be embodied differently according to sensing methods.
[0060] For example, in case of a pattern sensing method, the
sensing element 130 may be a pattern sheet composed of different
patterns for each coordinate point. In case of an IR sensing
method, the sensing element 130 may be an IR luminous unit which
emits IR signals having different frequencies at each coordinate
point. However, the technical features of the present exemplary
embodiments may be applied other types of sensing methods used by
the sensing element 130 to detect a coordinate point of a touch
input by the digital pen 200.
[0061] FIG. 3 is a block diagram illustrating the digital pen 200
according to an exemplary embodiment. As illustrated in FIG. 3, the
digital pen 200 includes a first sensing unit 210, a second sensing
unit 220, a control unit 230, a communication unit 240 and a memory
250.
[0062] The first sensing unit 210 detects sensing elements provided
on the touch screen 100. The first sensing unit 210 may be embodied
in different ways according to different sensing methods.
[0063] For example, in case of a pattern sensing method, the first
sensing unit 130 may be a pattern sensing unit to detect a
differently set pattern for each coordinate of a point. In the case
of an IR sensing method, the sensing element 130 may be an IR light
intercepting unit to receive an IR signal which may have a
different frequency according to each coordinate of a point.
However, the technical features of the present exemplary
embodiments may be applied to other type of sensing units which
detect sensing elements provided on the touch screen 100, using
other sensing methods.
[0064] The second sensing unit 220 detects a pulse signal which
operates the backlight unit 130 provided on the touch screen 100.
In this case, the second sensing unit 220 may be embodied as a
photo-diode to detect an on and off status of the touch screen 100
in order to confirm a pulse signal of the touch screen 100.
[0065] The communication unit 240 may transmit the detected pulse
signal and a coordinate of the touched point in a wired or wireless
manner to the external control unit 300.
[0066] When a user pre-stores pulse signal information
corresponding to the plurality of touch screens 100-1 and 100-2,
the memory 250 may match the information of a pulse signal and
information of its corresponding touch screen For example, an ID of
a touch screen and store them. For instance, the memory 250 may
match an A-type pulse signal which turns on and off once during a
period of "2t" as illustrated in the upper part of FIG. 5 for the
first touch screen 100-1 and store them, and match a B-type pulse
signal which turns on and off once during a period of "t" as
illustrated in the lower part of FIG. 5 for the second touch screen
100-1 and store them.
[0067] The control unit 230 detects a coordinate of the touched
point according to a sensing element detected by the first sensing
unit 210. Further, the control unit 230 may search information
corresponding to a touch screen, using a pulse signal detected by
the second sensing unit 220. The control unit 230 controls the
communication unit 240 to transmit information of a touch screen
corresponding to a pulse signal and the detected coordinate
information to the external control unit 300.
[0068] As illustrated in FIG. 4, if a user touches a point P1 of
the first touch screen 100-1, the control unit 230 detects
coordinate information of point P1, 100,100. The second sensing
unit 220 detects an A-type pulse signal which turns on and off once
during a period of "2t" as illustrated in FIG. 5, and the control
unit 230 detects that the touched touch screen is the first touch
screen 100-1. The control unit 230 may then transmit information
corresponding to a coordinate of the touched point P1, 100,100, and
information corresponding to the first touch screen 100-1 to the
external control unit 300.
[0069] However, in case that a user touches a point P2 of the
second touch screen 100-2, the control unit 230 detects coordinate
information of point P2, 100,100. The second sensing unit 220
detects a B-type pulse signal which turns on and off once during a
period of "t" as illustrated in FIG. 5, and the control unit 230
detects that the touched screen is the second touch screen 100-2.
The control unit 230 may then transmit information corresponding to
the coordinate of the touched point P2, 100,100, and information
corresponding to the second touch screen 100-2 to the external
control unit 300.
[0070] According to an exemplary embodiment, the pulse-widths of an
A-type pulse signal and a B-type pulse signal are different as
illustrated in FIG. 5, however the pulse cycles may be identical to
each other since the plurality of touch screens 100-1 and 100-2 may
be operated using identical brightness
[0071] According to another aspect of the exemplary embodiment, the
control unit 230 may also detect a pulse signal using an on and off
status of a touch screen detected by the second sensing unit 220
and immediately transmit it to the control unit 300 through the
communication unit 240.
[0072] With reference to FIG. 6, a method of recognizing a touch of
the display system 10 including the plurality of touch screens
100-1 and 100-2 will be explained below. FIG. 6 is a flowchart
provided to explain a method of recognizing a touch according to an
exemplary embodiment.
[0073] The plurality of touch screens 100-1 and 100-2 are operated
by the control unit 300 (S610). The plurality of touch screens
100-1 and 100-2 may be operated by different pulse signals set by a
user. At least one of a pulse-width and a pulse-shape of the pulse
signals of the plurality of touch screens 100-1 and 100-2 may be
set differently according to the plurality of touch screens 100-1
and 100-2.
[0074] When the digital pen 200 touches one of the plurality of
touch screens 100-1 and 100-2, the digital pen 200 detects a pulse
signal of the touched touch screen (S620). The digital pen 200 may
detect a pulse signal which operates a backlight unit provided on
the touched touch screen, using a photo-diode.
[0075] The digital pen 200 detects coordinate information of the
touched point (S630). For example, the digital pen 200 may receive
an IR signal emitted from a sensing element located at the touched
point out of a plurality sensing elements built into the touched
touch screen, recognize the sensing element located at the touched
point according to a type of the received IR signal, and detect
coordinate information corresponding to the detected sensing
element. According to another aspect of the exemplary embodiment,
the digital pen 200 may detect coordinate information by other
methods. For example, the digital pen 200 may detect coordinate
information by using specific patterns provided in the touch screen
100.
[0076] The digital pen 200 transmits information corresponding to a
pulse signal and coordinate information of the touched point to the
control unit 300 (S640). For example, the digital pen 200 may
transmit information corresponding to a pulse signal itself to the
control unit 300, and/or may transmit touch screen information
corresponding to the pulse signal to the control unit 300.
[0077] When the digital pen 200 transmits pulse signal information
and coordinate information of the touched point, the control unit
300 recognizes the touched touch screen and coordinate (S650). For
example, if the digital pen 200 transmits the pulse signal
information itself, the control unit 300 may recognize the touched
touch screen by reading and extracting touch screen information
corresponding to the pulse signal information.
[0078] As explained above, it is possible for the control unit 300
to control a touched touch screen to display an object at the
touched point of the touch screen, using a pulse signal which
operates the touch screen 100.
[0079] While not restricted thereto, an exemplary embodiment can be
embodied as computer-readable code on a computer-readable recording
medium. The computer-readable recording medium is any data storage
device that can store data that can be thereafter read by a
computer system. Examples of the computer-readable recording medium
include read-only memory (ROM), random-access memory (RAM),
CD-ROMs, magnetic tapes, floppy disks, and optical data storage
devices. The computer-readable recording medium can also be
distributed over network-coupled computer systems so that the
computer-readable code is stored and executed in a distributed
fashion. Also, an exemplary embodiment may be written as a computer
program transmitted over a computer-readable transmission medium,
such as a carrier wave, and received and implemented in general-use
or special-purpose digital computers that execute the programs.
[0080] The foregoing exemplary embodiments and advantages are
merely exemplary and are not to be construed as limiting to the
present inventive concept. The present teaching can be readily
applied to other types of apparatuses. Also, the description of the
exemplary embodiments is intended to be illustrative, and not to
limit the scope of the claims. Many alternatives, modifications,
and variations will be apparent to those skilled in the art.
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